<template>
  <div 
    :class="className" 
    :style="{height:height,width:width}"/>
</template>

<script>
import echarts from 'echarts';
require('echarts/theme/macarons'); // echarts theme
import { debounce } from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart'
        },
        width: {
            type: String,
            default: '100%'
        },
        height: {
            type: String,
            default: '300px'
        }
    },
    data() {
        return {
            chart: null
        };
    },
    mounted() {
        this.initChart();
        this.__resizeHandler = debounce(() => {
            if (this.chart) {
                this.chart.resize();
            }
        }, 100);
        window.addEventListener('resize', this.__resizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        window.removeEventListener('resize', this.__resizeHandler);
        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');

            this.chart.setOption({
                tooltip: {
                    trigger: 'item',
                    formatter: '{a} <br/>{b} : {c} ({d}%)'
                },
                legend: {
                    left: 'center',
                    bottom: '10',
                    data: ['Industries', 'Technology', 'Forex', 'Gold', 'Forecasts']
                },
                calculable: true,
                series: [
                    {
                        name: 'WEEKLY WRITE ARTICLES',
                        type: 'pie',
                        roseType: 'radius',
                        radius: [15, 95],
                        center: ['50%', '38%'],
                        data: [
                            { value: 320, name: 'Industries' },
                            { value: 240, name: 'Technology' },
                            { value: 149, name: 'Forex' },
                            { value: 100, name: 'Gold' },
                            { value: 59, name: 'Forecasts' }
                        ],
                        animationEasing: 'cubicInOut',
                        animationDuration: 2600
                    }
                ]
            });
        }
    }
};
</script>
